For physical authentication, vein scanning [1] seems pretty neat -- though it's no more a replacement for passwords than a fingerprint is. [1] https://www.yout

For physical authentication, vein scanning [1] seems pretty neat -- though it's no more a replacement for passwords than a fingerprint is. [1] https://www.youtube.com/watch?v=eDo0W1tEkpk https://www.youtube.com/watch?v=eDo0W1tEkpk